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linux:udev [2017/04/25 10:33] – niziaklinux:udev [2023/12/13 16:31] (current) – niziak
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 === reloading rules === === reloading rules ===
 <code bash>udevadm control --reload-rules</code> <code bash>udevadm control --reload-rules</code>
 +<code bash>udevadm control --reload-rules && udevadm trigger</code>
  
 === Testing rules === === Testing rules ===
 <code bash>udevadm test /sys/class/tty/ttyACM0</code> <code bash>udevadm test /sys/class/tty/ttyACM0</code>
 +
 +NOTE: This program is for debugging only, it does not run any program specified by a RUN key. It may show incorrect results, because some values may be different, or not available at a simulation run.
  
 ==== Getting info ==== ==== Getting info ====
 <code bash> <code bash>
 udevadm info --attribute-walk --path=/sys/class/tty/ttyACM0 udevadm info --attribute-walk --path=/sys/class/tty/ttyACM0
 +udevadm info --attribute-walk --name=/dev/ttyUSB0
 </code> </code>
  
Line 22: Line 26:
 </file> </file>
  
 +<code bash>
 +udevadm control --log-priority=debug
 +
 +</code>
  
 ==== Rules ==== ==== Rules ====
Line 39: Line 47:
  
  
-=== Executing commands ===+==== Executing commands ====
 Triggering commands should be done using RUN, because it is executed after all systemd actions. Triggering commands should be done using RUN, because it is executed after all systemd actions.
 <code> <code>
Line 55: Line 63:
 /imei.json'" /imei.json'"
 </code> </code>
 +
 +=== Shell ENV ===
 +<code bash>
 +ID_BUS=usb
 +DEVNAME=/dev/ttyACM0
 +ID_VENDOR_FROM_DATABASE=Telit Wireless Solutions
 +ACTION=add
 +ID_SERIAL_SHORT=356611070046259
 +ID_USB_DRIVER=cdc_acm
 +ID_TYPE=generic
 +MAJOR=166
 +DEVPATH=/devices/platform/ocp/47400000.usb/47401c00.usb/musb-hdrc.0.auto/usb1/1-1/1-1:1.0/tty/ttyACM0
 +ID_MODEL_ENC=FIH7160
 +ID_USB_INTERFACES=:020201:0a0000:020d00:0a0001:
 +ID_MODEL=FIH7160
 +DEVLINKS=/dev/serial/by-path/platform-musb-hdrc.0.auto-usb-0:1:1.0 /dev/serial/by-id/usb-Telit_FIH7160_356611070046259-if00
 +ID_SERIAL=Telit_FIH7160_356611070046259
 +SUBSYSTEM=tty
 +ID_MODEL_ID=0036
 +MINOR=0
 +ID_PATH=platform-musb-hdrc.0.auto-usb-0:1:1.0
 +ID_MODEL_FROM_DATABASE=LE910 V2
 +ID_VENDOR_ENC=Telit
 +ID_PATH_TAG=platform-musb-hdrc_0_auto-usb-0_1_1_0
 +ID_VENDOR=Telit
 +ID_USB_INTERFACE_NUM=00
 +ID_VENDOR_ID=1bc7
 +ID_REVISION=1730
 +</code>
 +
  
 === Creating device symlinks === === Creating device symlinks ===
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 ''link_priority'': higher has higher priority ''link_priority'': higher has higher priority
  
 +Define symlink name in device tree (add property ''symlink'') i.e:
 +<code>
 +&pwm4 {
 + pinctrl-names = "default";
 + pinctrl-0 = <&pinctrl_pwm4>;
 + status = "okay";
 + symlink = "buzzer";
 +};
 +</code>
 +
 +<code>
 +ATTR{device/of_node/symlink}!="", ENV{DEVNAME}!="", SYMLINK+="%s{device/of_node/symlink}"
 +</code>
 +
 +See:
 +  - [[https://github.com/mvduin/py-uio/blob/master/dts/pwmss2.dtsi#L122|pwmss2.dtsi]]
 +  - [[https://github.com/mvduin/py-uio/blob/master/etc/udev/rules.d/10-of-symlink.rules|10-of-symlink.rules]]
 +  - [[https://github.com/mvduin/py-uio/blob/master/dts/pwmss2.dtsi|pwmss2.dtsi]]
  
 === Triggering systemd === === Triggering systemd ===
Line 70: Line 126:
 SUBSYSTEM=="printer", TAG+="systemd", ENV{SYSTEMD_WANTS}="printer.target" SUBSYSTEM=="printer", TAG+="systemd", ENV{SYSTEMD_WANTS}="printer.target"
 </code> </code>
 +
 +More info about systemd interactions: [[https://www.freedesktop.org/software/systemd/man/latest/systemd.device.html|systemd.device — Device unit configuration]]
  
 === Prevent ModemManager === === Prevent ModemManager ===